What do you do if you don't have a book-bag for school?

Answer 1

You should

a) buy a bag

-or-

b) carry your stuff in your hands.

Answer 2

If you don't have a book bag for school, you can use a backpack or another suitable bag to carry your books and school supplies. Alternatively, you can also carry your items in a reusable shopping bag or a tote bag. Just make sure the bag is sturdy enough to hold everything you need for the day.